Ok, just came back from seeing this. It's almost hard to give my two cents because I decided to watch it in IMAX 3D and that turned down to be a big mistake. I will never watch another 3D movie again, ever. It's just not for me. Puts such a strain on the eye and I feel like it's hard to focus on what's really happening. I feel like I didn't truly enjoyed the movie because of it.
but from what I was able to absorb, I can say the movie was good. Best part for me was the scenes with the space ships in Asgard, Thor's fighting scenes and Cap's cameo. Some small nitpicks though... like for example, why was Erik Selvig acting all crazy and ridiculous? He was always a pretty respectable scientist in all previous movies but suddenly he is crazy? No justification for that AT ALL. Also, they put too much focus on those devices of his at the end of the movie. It appears Thor would not have won without it.
Also, that ending with Loki is in need of discussion. Did he kill Odin? I almost feel that the extra scenes they filmed for Loki were the ones we have seen at the end (him seating at the throne), almost as if they were really gonna get rid of him, but decided to go another direction in the last minute.